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https://issues.apache.org/jira/browse/IGNITE-4140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15716945#comment-15716945
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Valentin Kulichenko commented on IGNITE-4140:
---------------------------------------------

The ticket is scheduled for 2.0, so we can just change the API.

Regarding the code I have only these minor comments:
* You removed the license header from {{KafkaStreamer}}. Please bring it back.
* Why did you use explicit check instead of {{A.ensure}} and {{log.error}} 
instead of {{U.error}}? This is against guidelines, so please revert.
* We are using spaces instead of tabs for indentation.

Please fix these and we will merge your contribution.

> KafkaStreamer should use tuple extractor instead of decoders
> ------------------------------------------------------------
>
>                 Key: IGNITE-4140
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4140
>             Project: Ignite
>          Issue Type: Improvement
>          Components: streaming
>    Affects Versions: 1.7
>            Reporter: Valentin Kulichenko
>            Assignee: Anil
>              Labels: patch-available
>             Fix For: 2.0
>
>
> Current design of {{KafkaStreamer}} looks incorrect to me. In particular, it 
> extends {{StreamAdapter}}, but ignores tuple extractors provided there and 
> uses native Kafka decoders instead. This for example makes impossible to 
> produce several entries from one message, like it can be done via 
> {{StreamMultipleTupleExtractor}} in other streamers.
> To fix this, we should:
> # Declare the {{KafkaStreamer}} like this:
> {code}
> KafkaStreamer<K, V> extends StreamAdapter<MessageAndMetadata<byte[], byte[]>, 
> K, V>
> {code}
> # Remove {{keyDecoder}} and {{valDecoder}} in favor of tuple extractors.
> # Instead of doing {{getStreamer().addData(...)}} directly, call 
> {{addMessage(...)}} method providing the raw message consumed from Kafka 
> ({{MessageAndMetadata<byte[], byte[]>}}). This method will make sure that 
> configured extractor is invoked and that all entries are added to 
> {{IgniteDataStreamer}}.



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